# American Institute of Mathematical Sciences

November  2016, 15(6): 2059-2074. doi: 10.3934/cpaa.2016027

## On the Hardy-Littlewood-Sobolev type systems

 1 Department of Applied Mathematics, University of Colorado at Boulder, Colorado 2 Department of Mathematics, INS and MOE-LSC, Shanghai Jiao Tong University, Shanghai, China 3 Department of Applied Mathematics, University of Colorado at Boulder

Received  October 2015 Revised  June 2016 Published  September 2016

In this paper, we study some qualitative properties of Hardy-Littlewood-Sobolev type systems. The HLS type systems are categorized into three cases: critical, supercritical and subcritical. The critical case, the well known original HLS system, corresponds to the Euler-Lagrange equations of the fundamental HLS inequality. In each case, we give a brief survey on some important results and useful methods. Some simplifications and extensions based on somewhat more direct and intuitive ideas are presented. Also, a few new qualitative properties are obtained and several open problems are raised for future research.
Citation: Ze Cheng, Genggeng Huang, Congming Li. On the Hardy-Littlewood-Sobolev type systems. Communications on Pure & Applied Analysis, 2016, 15 (6) : 2059-2074. doi: 10.3934/cpaa.2016027
##### References:
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##### References:
 [1] F. Arthur, X. Yan and M. Zhao, A Liouville-type theorem for higher order elliptic systems, Disc. & Cont. Dynamics Sys., 34 (2014), 3317-3339. doi: 10.3934/dcds.2014.34.3317.  Google Scholar [2] H. Berestycki, P. L. Lions and L. A. Peletier, An ODE approach to the existence of positive solutions for semi-linear problems in $R^N$, Indiana University Mathematics Journal, 30 (1981), 141-157. doi: 10.1512/iumj.1981.30.30012.  Google Scholar [3] L. Caffarelli, B. Gidas and J. Spruck, Asymptotic symmetry and local behavior of semilinear elliptic equations with critical Sobolev growth, Comm. Pure Appl. Math., 142 (1989), 615-622. doi: 10.1002/cpa.3160420304.  Google Scholar [4] W. Chen and C. Li, Classification of solutions of some nonlinear elliptic equations, Duke Math. J., 63 (1991), 615-622. doi: 10.1215/S0012-7094-91-06325-8.  Google Scholar [5] W. Chen, C. Li and B. Ou, Classification of solutions for a system of integral equations, Commun. in Partial Differential Equations, 30 (2005), 59-65. doi: 10.1081/PDE-200044445.  Google Scholar [6] W. Chen, C. Li and B. Ou, Classification of solutions for an integral equation, Comm. Pure Appl. Math., 59 (2006), 330-343. doi: 10.1002/cpa.20116.  Google Scholar [7] Z. Cheng, G. Huang and C. Li, A Liouville theorem for subcritical Lane-Emden system,, \arXiv{1412.7275}., ().   Google Scholar [8] Z. Cheng and C. Li, Shooting method with sign-changing nonlinearity, Nonlinear Analysis: Theory, Methods and Applications, 114 (2015), 2-12. doi: 10.1016/j.na.2014.10.019.  Google Scholar [9] B. Gidas, W. M. Ni and L. Nirenberg, Symmetry of positive solutions of nonlinear elliptic equations in $R^n$, Math. Anal. and Applications, Part A, Advances in Math. Suppl. Studies, 7A (1981), 369-402.  Google Scholar [10] Y. Lei and C. Li, Sharp criteria of Liouville type for some nonlinear systems, Discrete Contin. Dyn. Syst., 36 (2016), 3277-3315. doi: 10.3934/dcds.2016.36.3277.  Google Scholar [11] Y. Lei, C. Li and C. Ma, Asymptotic radial symmetry and growth estimates of positive solutions to the weighted HLS system, Calc. Var. of Partial Differential Equations, 45 (2012), 43-61. doi: 10.1007/s00526-011-0450-7.  Google Scholar [12] C. Li and J. Villaver, Existence of positive solutions to semilinear elliptic systems with supercritical growth, Comm. in Partial Differential Equation, 41 (2016), 1029-1039. doi: 10.1080/03605302.2016.1190376.  Google Scholar [13] E. Lieb, Sharp constants in the Hardy-Littlewood-Sobolev and related inequalities, Ann. of Math., 118 (1983), 349-374. doi: 10.2307/2007032.  Google Scholar [14] J. Liu, Y. Guo and Y. Zhang, Existence of positive entire solutions for polyharmonic equations and systems, Journal of Partial Differential Equations, 19 (2006), 256.  Google Scholar [15] E. Mitidieri, Nonexistence of positive solutions of semilinear elliptic systems in $R^N$, Quaderno Matematico, (1982), 285.  Google Scholar [16] E. Mitidieri, A Rellich type identity and applications: Identity and applications, Communications in partial differential equations, 18 (1993), 125-151. doi: 10.1080/03605309308820923.  Google Scholar [17] E. Mitidieri, Nonexistence of positive solutions of semilinear elliptic systems in $R^N$, Differ. Integral Equations, 9 (1996), 465-479.  Google Scholar [18] S. Pohozaev, Eigenfunctions of the equation $\Delta u + \lambda f(u)=0$, Soviet Math. Doklady, 6 (1965), 1408-1411.  Google Scholar [19] P. Polacik, P. Quittner and P. Souplet, Singularity and decay estimates in superlinear problems via Liouville-type theorems, Part I: Elliptic equations and systems, Duke Math. J., 139 (2007), 555-579. doi: 10.1215/S0012-7094-07-13935-8.  Google Scholar [20] P. Pucci and J. Serrin, A general variational identity, Indiana Univ. J. Math., 35 (1986), 681-703. doi: 10.1512/iumj.1986.35.35036.  Google Scholar [21] Pavol Quittner and Philippe Souplet, Superlinear Parabolic Problems: Blow-Up, Global Existence and Steady States, Springer, 2007.  Google Scholar [22] J. Serrin, A symmetry problem in potential theory, Arch. Rat. Mech. Anal., 43 (1971), 304-318.  Google Scholar [23] J. Serrin and H. Zou, Non-existence of positive solutions of Lane-Emden systems, Differ. Integral Equations, 9 (1996), 635-654.  Google Scholar [24] J. Serrin and H. Zou, Existence of positive solutions of the Lane-Emden system, Atti Semi. Mat. Fis. Univ. Modena, 46 (1998), 369-380.  Google Scholar [25] P. Souplet, The proof of the Lane-Emden conjecture in four space dimensions, Advances in Mathematics, 221 (2009), 1409-1427. doi: 10.1016/j.aim.2009.02.014.  Google Scholar [26] J. Wei and X. Xu, Classification of solutions of higher order conformally invariant equations, Math. Ann., (1999), 207-228. doi: 10.1007/s002080050258.  Google Scholar
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